Spring-actuated valve to be used on pump discharge.
弹簧执行机构止回阀用于管道排放。
Some styles are spring-actuated for immediate closure when flow stops.
有些类型止回阀配置弹簧驱动，能够在流动停止时，立即关闭阀门。
Spring-actuated valve to be used on pump discharge. Swing check with outside lever and spring to be used on sump, sewage and storm drain lines.
弹簧执行机构止回阀用于管道排放。外置操作手柄和弹簧执行机构的旋启式止回阀用于污水坑、排污和雨水排泄管道。
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